package com.guide.geek.utils;

import java.io.File;

import android.content.Context;
import android.os.Environment;
import android.os.StatFs;
import android.util.DisplayMetrics;
import android.util.Log;

public class CommonUtil {

	/**
     * 检测sdcard是否可用
     * 
     * @return true为可用，否则为不可用
     */
    public static boolean sdCardIsAvailable() {
            String status = Environment.getExternalStorageState();
            if (!status.equals(Environment.MEDIA_MOUNTED))
                    return false;
            return true;
    }

    /**
     * Checks if there is enough Space on SDCard
     * 
     * @param updateSize
     *            Size to Check
     * @return True if the Update will fit on SDCard, false if not enough space on SDCard Will also return false, if the SDCard is
     *         not mounted as read/write
     */
    public static boolean enoughSpaceOnSdCard(long updateSize) {
            String status = Environment.getExternalStorageState();
            if (!status.equals(Environment.MEDIA_MOUNTED))
                    return false;
            return (updateSize < getRealSizeOnSdcard());
    }

    /**
     * get the space is left over on sdcard
     */
    public static long getRealSizeOnSdcard() {
            File path = new File(Environment.getExternalStorageDirectory().getAbsolutePath());
            StatFs stat = new StatFs(path.getPath());
            long blockSize = stat.getBlockSize();
            long availableBlocks = stat.getAvailableBlocks();
            return availableBlocks * blockSize;
    }

    /**
     * Checks if there is enough Space on phone self
     * 
     */
    public static boolean enoughSpaceOnPhone(long updateSize) {
            return getRealSizeOnPhone() > updateSize;
    }

    /**
     * get the space is left over on phone self
     */
    public static long getRealSizeOnPhone() {
            File path = Environment.getDataDirectory();
            StatFs stat = new StatFs(path.getPath());
            long blockSize = stat.getBlockSize();
            long availableBlocks = stat.getAvailableBlocks();
            long realSize = blockSize * availableBlocks;
            return realSize;
    }
    
    /**
     * 根据手机分辨率从dp转成px
     * @param context
     * @param dpValue
     * @return
     */
    public static  int dip2px(Context context, float dpValue) {  
	    final float scale = context.getResources().getDisplayMetrics().density;  
	    return (int) (dpValue * scale + 0.5f);  
	}  
	      
	/** 
	 * 根据手机的分辨率从 px(像素) 的单位 转成为 dp 
	 */  
	public static  int px2dip(Context context, float pxValue) {  
	    final float scale = context.getResources().getDisplayMetrics().density;  
	    return (int) (pxValue / scale + 0.5f)-15;  
	} 

}
